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On the magnetic compensation effect of lithium‐chromium ferrites Li 0.5 Cr x Fe 2.5– x O 4 (0 ≤ x ≤ 1.55)
Author(s) -
Rais A.,
Gismelseed A. M.,
AlOmari I. A.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541085
Subject(s) - chromium , spinel , curie temperature , magnetization , analytical chemistry (journal) , lithium (medication) , diffraction , materials science , mössbauer spectroscopy , x ray crystallography , crystallography , chemistry , condensed matter physics , magnetic field , ferromagnetism , metallurgy , physics , optics , medicine , chromatography , quantum mechanics , endocrinology
Lithium‐chromium ferrites Li 0.5 Fe 2.5– x Cr x O 4 (0 ≤ x ≤ 1.55) were studied using X‐ray diffraction, magnetization measurements and Mössbauer spectroscopy. X‐ray diffraction patterns show that all samples have cubic spinel structure. The temperature dependent magnetic measurements revealed that a magnetic compensation point appears at chromium concentration x = 1.05, 1.25 and 1.55. Moreover, it was observed that the Curie temperature T C decreases and approaches the compensation temperature T K as Cr 3+ substitution for Fe 3+ increases. The magnetization data at all concentrations are discussed in the light of Néel's molecular field model taking into account the cation distributions obtained using the analysis of Mössbauer spectra. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)